Type wheel stop unit



Aug. 10, 1943; aw. HEWITT TYPEWHEEL STOP UNIT Filed July 21, 1942.INVENTOR E.w. HEWITT I, BY 2 ATTORNfrIY Patented Aug, 10, 1943 itypewheel: shaft stop: units of the type employed number possiblewithout thesh'i'it disc in telegraph recorders to" selectively positionthe typewheel in accordance with received =code 7 'groups of impulsesprior to a recording-or other T typewhee1 shaft stop units whichare-selectively 'nals' to angularly position thetypewheel-lshaftlectabl'e ele rnents employed to l printing-position-.Thestop-unitsiincludenotched which resultsininadvertently p ri I'gularly into; one or the 'other offtwcpositions in Iniaccordancewiththee QV,-lt 1s I accordance with respective signaling impulses: ofmain objects of-thepresentinventionjo pro de' V notches in theneripheriesofithecode discshsurof the aboi etybe'wherebyFthe'shiftdi'scimay lie l V To ina discare inalignment with one or more e Vnotches in each of'theiother, discs; one ormore 7 contrellin'gsignal. *1

inwardly into the aligned row or rows of notches w mittedfin-fgr'e'aternumbers than th'e unfir ease V f typewheel. shaft which has rotatabletherewith a tohave insertedtherein anumber 'of uppercase Telegraphrecorders usually operate" 'in r transmission of asma and an unshiftsignal lore-f V code discs a total of 32- permuted settings there- 40,.signals o'ther than to properly condition the 1 I 7' 7 shift disc 'issometimesemployed. Thi's' 'disc'is 45 the'd'riun' type ,e'mployinsia'shift disc whichfau'j positionable into one or the other ofJtwopositomatically moves frc rn a shiftto an'unsh ift 'sig ti'ons inresponse to shift and unshift-sinalsand nal'on the receipt,pfa-predeteri nined group of is usually 'cperated-from one position tothe other signalsfsuch as tn letter pace signal. The let V r by twocorresponding predetermined selected ale ter'spacejsi'gnal is"ordinarily;transmittedfollow exist in the code discs for eachpermutedsetting is efi 'ecti-Ve to 'return theprinte1 to its u'nshift thereof,the shift. disc maybe employed to deposition- Without the necessity 0f'also'transmitF terminewhich one of the associated selectable V tinganunshiftsig'nal'; '2' elements is selected. Thus,. the numberiof selectA' more specificobject of the 'invention i's ahle elementswhichareselectable one at a time 55; provide a stop unit of the abo ety pewhereiri v {TYPEWHEEL s'roe me i 7 Ernest 'WI Idewitt, Stamford; lfimrr;assigncrz to; V

The JVest'ern Union Telegraph Company,

1 N w York, N 32', 'a corporaticn ofNew York I Aenlicatien idly 21-,weasel-is: ra iates l V. a l r ,l a, =we s-i w re-a 41 Their present,invention; r'elates-Drimarilyfito ,can be-iricreased to "apn'r functionsofthe recorders. 7 1 we Telegraph recordersrof the'typevthatinclude tpewheels in the recording units usually employ e 4 tivefly 6 3 83 10r'n'ovean order Controlled in accordance; with the receivedisigr0:load'than absolutely-necessa and. typewheel rotatable'therewithiso;-that :the Withanfeas'ily'mo blefshift -disc l l'i'l 8. desiredcharacter on the tynewhe'el- 1s placed' in J dentally move "fr'cm onepositionto rtheiother; ingof upper code ,discs which are selectivelypositioned an-i [5 case charactersfor l'owercaseflor the code groups toformyarious; alignments of a positive lockfor the-shift disc in"stpo'uni s rounding the code discs are a series of selectable memberswhich are urged .towardythe-centers of the discs and, when one or morenotches of the selectable members are permitted to move- The lowercaseCharacters a1" usual I V to a selected position. Extending: throughthecharacters,' and the usual practice when trans 7 center of the'codediscs; is africtionally driven mitting l'etters-orrlower casecharacterswhich are typewheel and a stop arm. ,The stop' arm nor-Qcharaeters o rfigures' isto transmit ashiit signal v mally passesunderneath theselectable-elements; precedingjtfigurecha'racters"andthentrans; 1

but when one is selected by entering a row of a mit an. unshiit signalfollowingfithefsame; In F" aligned notches in the code dis'cs, it'moIVesinto certain 'types' of telegraph service the'figure charr thepath of the stoparm to stop the typewheel- I acters' a-reinterposedintotheletter characters.

in a corresponding p'ositionf more: or less frequently andobviouslyrequire the sponse to a five-unit code, and as there is a code,1 ceding and following 'eabh group-Tor figure name 3 disc for each unitor variable impulse of the ters. 'No useful function 'in'the printer ispercode, there are also five code discs? With five"formed-onthereceipto'f'thie'shift-Iand unshift ef'are possible'andaccordingly by employing five printer, and obviouslysuchfpracticeis'\7\( ast efiil i '7 code discs any one of 32- selectable elements mayofline-tim'e. E 3 l 7 be selected one at a time. In'crder to increase 1Accordingly; it is another -'object of the flpresent l l the 'possiblenumber of selections, a fsoacalled' V invention to provide*a type'wheelstop" ui'iit of 5 elonientsnf the stcpunit. "Iftwo rows of notches ingeach group oi -figure--chara'ctel s and hence I disc locking elements;and

disc operating elements; Referring .now to the drawing, the elementscomprising the present invention. and the man Q'ner inwhich they operateand combineewith the shift position in response to a letter space signalor which may beinoved' to its unshift position in response to, anunshift signal.

The above and further objects of the invention will bemore ap'parentfromthefollowing detailed description thereof when taken in conjunction withthe accompanying drawing, in the latter of which:"

Fig.1 is'an exploded'perspective view'of a typewheel stop unit embodyingtherein the present" 7 invention and showing the manner in which theelements of the present invention cooperate with the elements of thestopunit;

Fig. 2 is an enlarged detailed :view of the shift l the shiftdisc isautomatically moved to an unone of the stop members [9, the said stopmember is' permitted to move inwardly a slight amountinto the alignedrow of notches to a selected position. As the'notches. [5 in each codedisc M are in a different arrangement or order, various rows of alignednotches therein maybe formed, depending upon the permuted settings ofthecodediscs.

YWith five code-discs:l4 ,.the"usua1 number employed thirty-two permutedsettings thereof are possible, and asfmore than thirty-two charactersare required to transmit telegraph messages,

' shift and. unshift signals are employed. The

Fig. 3 is an enlarged detailed view of the shift elements of a drumitypestop unittoaccomplish I 1 the above' objects will now be; describedindetail The stop unit shown isofthetype such as that described inconsiderable detail in a ,copending fapplication of R. F. Dirkes et al..Serial No.

318,021, 'filed1February- ,9, 1940, and hereinafter 'thei -descriptionof-the well-known elements "of the-stop unit will be limited to themanner in V whichfthey'cooperate with the elements comprising thepresent invention. Although the, in.-v

' of the shift disc 23 will determine which oneof the associated stopmembersis selected." In'this.

vention is shownand herein described as cooper ating with thisparticular; type of stop unit, it

1 willbe obviousthat the applicationof the invention is not limited toethis particular stop vunit 1 but may be applied to;; various--0ther,'specific,

types. The-stop unit includes the usual,type-' wheel shaft ll, Fig. 1,which is frictionally drivsired speed" through a friction .clutch (not Ishift and unshift signals control'the position of a shift disc 23,'andit in turn determines which one of two stop members i 9 is selected whenthe code discs are position so that two rows of notches are inalignmentand in operative relation with the two selectable elements or stopmembers I 9. Thus, if the code discs are'so arranged that-forsomepermuted settings'thereof two' rows of notches eiiist therein, theposition mannerithe number of p'ossible selectionsmay be practicallydoubled over the number 1 possible with but the five code discs l4. 7JThe shift disc 23 has no associated selector'to control thepositionthereof, but it is normally movedi or shifted from one positionto the other, as hereinafter pointed out,*by shiftand unshift stopmembers such as l9aj and l-9b, re'spectively,

the said. stop members being selected in re- 1 ,spon'se ito shift .and'unshifti signal code groups.

en from asuitable 's jourceof power atthe desh own .jAsshown in thedrawing, the type a wheel shaft has fixed directly thereto a type-Qwheel lffwhich has buta'single'row of characters on the peripherythereof. Also fixed tofthe V typewheelshaft it for rotation therewith isa stop arm I3 which,--in a manner hereinafter de- M scribed,effectsstopping ofthe'typewheefl shaft and typewheel l2 in selectedangularpositions';

The stop unit also includes a set offive differf ently notchedcode discs|'4,,'the notches l5. in

the code discs being located in the peripheries thereof. --The codediscs are mounted-concentrically with the typewheel shaft in the usualmanner and are rotatably movable or-shiftable within predeterminedlimits about the" type-,7 7 wheel shaft H. .A set of transfer bars. (notshown) are'usually employed-to permutatively The shiftand-unshift-stop-members I911 and [9b are located adjacent eachother,and posi- -tioned-between these tx'vo'stop members is a shift lever24;'Figs; 1 arid 3. ,i-Th'is shift'lever 24 is'pivotally mountedon ashouldefscrew 26 supported in the frontguide plate l6 and has abifurcation 21 therein which engages a pin 28' extending axiallyfrom'the side of the shift disc 23. Secured'tothe shift and urishiftstopmembers lfia and ISU-bysQfn means, such as spot 7 welding, are angularbrackets 29 which are arrangedso-as to engage shoulders 3! on oppositesides'pf the shiftlever'24.

With th'eshift disc 23 in its unshift position,

or the position shown in'Fig.*3, the selection of thshift stop, member19a causes'the bracket member 29 thereon to engage the 'righthandshoulder 3| of the shiftlever 24-topivot the said lever. in' aclockwise'direction. As the 'shift,

lever pivots in this direction, the bifurcation'l'l engaging the pin.ZBshifts, the disc 23 in a counterclockwise direction into its shiftposition. As

set the code :discs 14 in accordance with; the set-f ting of. acorresponding set of selectors which 1 are positioned in accordancewithreceived code groups of impulses. v

Located at each end of the stop selectable elements or stop members I9which are urged inwardly toward the center] of the typewheel shaft by'means of resilient", bands suchas garter. or circular coiled radiallycontractablesprings'll. The springs.2l,inurging the stop'tmembers 1,9inwardly, hold .thesame in engagement with the peripheries ofthe codediscs li and when an alignedrow of notches in each of the .code discs 14are formed beneath,

unit are guide discs. I 6 and ll which are slightly" larger in diameterthan the code discs' l4, and have arran ged around the peripheriesthereof a-series of! radial slots llle Located iin thefslots I8 are"the' notches 15 in the code discs l4.

one' stop member, such as the shift stop member I90. is selected, thepreviously selected memher will be .cammed back into its normal-posi- I9.. Th6 shift and unshift stop members I91; and,

leb. may have an appreciable amount of Work to do in moving the shiftdisc 23, and individual helper springs=suchas2ll attached to the stopmembers may be employed to assist the garter spr s? ,in ureine thQ-Js tp: meme w Q ii pe i wember slab l, c and [9d hereinaiter deseribedi melyalso' zhewe helper springssuch as 20.,

1 IT-heshift a dun hiwstopgmembr il n e il-selectedpositions;duting'gtheselection 0i, 7

otherlstop: members, and hence rip-net hawegany efiectinkeeping-theshift olise i3=inleither-oneorij V the other ofitstwoQositionsl;Detentsare some times employed to bias the shift disc; into either v t oosi ense ut/ hee eet ofi e detent-S:

stop member. heel; intoiitsgnormlimseleoted: I position, end thisimposes an: unnecessary lead onthe transfer mechanismresultingin;premae" ture wearing other :ohvieus disadvantages: In order toeliminate the; disadvantage of pla'ck ring a: heevyloatl on thetranskr.--mechanism V which is operative to selectively positionthe codef discs Hi. the'shift disc Z3-shotlldibe eesily shifted. Withthe'shiftdisc easily'shif-tlbleithe jerringi:

of theprinter'inoident tothe'nor-m 5 vibration; e f i 7 1112 5Operation: thereof mayoveroome the 'detent;

neither of the shift stop:members isiatell timesoperetiveto-tbiastheshift disczinonemrtheother l oi its two'positionsz 1I inorder to have a vshifti diso that'iseasily'mov able with;the-ettenQaIlt advantages; .while'; at-the same time rpreventing:the-movement thereoi clurr-t 1 ing the selection of; characterdeterminingstopi membersi'a/lqck-sfor thejshiit disc isiDlovifled inxaccordaurice with thepresentr inyentiun whiclrqis effective to lock-theshift disc. im'e'ither' of. its

operated positions and prevent, undesired= movement thereof. Thelocking. arrangement for'theshift disc includesfaslock platet32;:Figs-;1" and 2,;

attached by-mea-ns of a screw33;to. the*sicleof the- 7 shift disc- 23;

The lock p1at6'3'2.l1 aSFani axially" extendingprojection 31; extending:parallel w the;

typewheelshaft: 1:! inoperative: relation with a: projection 361011 a:lock levers31i, The' lonk'leveni 311s pivotallymounted on a; shoulderscrew. 38

supportedin' a: stationarymountingrplatei 3391 lo.-.

catedi between: the frontv guide." plat-e46 andithe' shift disc 23. Anopening His: formed-inquire? the projection 36: thereofi to extend:-therethroughz- Thelock lever 3 1 has a 'springfi iatlraicheflrthexetofwhich tends-to pivot the: same' in' aircountenclock T wisedirection andholcis theiend of-the'clower arm:

43: thereof in engagement-"With theiinner edgeof ashift disc lockvstopmember: i190.

as that shown in Fig; 2 -..thepr0jeotion -35 on. the lockilever 3'! willbe positioned: below the projeo-- tion 34 on thelock plate and. therebyprevent'the movement of the'shift disc in w'clockwise: direc tion to itsunshift: position-J Such: e; positioniof the lock lever is shown by rthedotted outline thereof in Fig; 2..

= In e'ocordemee with thespresentinventlon, the

' shift disc lock stop'memberl '5 So is arranged. .to be selected or;moved inwardly oh the selectlomof v inner edge-thereof engagesthezendzofithe a/rmAi "b e ing selectect;simultaneowlytherewithz unlooheshift-disc leele'stopmember-139C beck-into their normal positions;whereupon the spring; tztpiyots 15 -34 in1itsj unshiltpositioma d=;.wil1rem ain-inithisf I" upositionuntilthesubsequent seleotionaof the shift'stop member IiQw. toeethenlwithlthe shiftdise look;

i stop: member H; The: seleetionafof these: two; stop members; unlocksthe shift-disc? andr moves- Withthe above: arren'gement,-, it: is;obvious that? I the shift-diso isipe'sitively looked in either'oner ofi'ttetvyd hift positions?andwilltremeinEinnposition 3oireeeipt-ofotherspec'ialr signalsas hereinafterrde- 1 spribedax Also; withxthetpositivezloclclforth'e sh t one positionzto the" other 'withoutimposing;an? apbre'ciablefloequpomtherstowmembersemployed; to jshii t'ithe sameir1 3 .telegraph;messegespthey esually' ocour', esherei-}i w Following:thefitrensmi'ssion. oi ai 'gr'oup of. fignr 1 letters characters;aiiletterspaeetz.ichareiclten 183' sume the transmiss-io characters zinunshift'signal hestobetransmitterlr C cordithez letter'charaiefier'sfi:In some typesoftelet 5 gnapmcircuits theig roupsrofs figures occurrather";

*character following each group of figures Charasters;alconsiderebleamount:efilirie tirnefmaybe Vconsumed;andiasthereiis noerecordirrei oneration -v r 7 guide plateiitso as to fiermi't'the lookaplateandf l feature ofthe:presentii'wention,theishift dise 'zfi s t following: 'a group 'offig-ur'es or upper case fehar i- With the j actensa stoptmember we inits normal: unselected posi 6 tionand the'shiftidisc fi 'in its ehiftposit-ion such her, no recordiz-rrg 11mmthei'iieoordingfljlenk 4fectedi=Sjecured'to thefword spa'oe stop -mei 5131011: All onthe shiftleveri-Mz'Ilheilower namei Z V withithe' lefthand Vanni-493 V I v. i V

otaflly mcnmtedladjecentitsi enter:oniaishoulder-a ,ef-ttheloeleleverfil wise direction; to, withdraw: gthet shift. position:andifie llllS t8 20p s-l-sb isls lestedy vt stop em thelshiftj use; 12s aneermits' thegunshift strip g men1be1 1isefieetive-tecamthe meg .7 jviousl yseleotedlunshift stopmemberxiEBb-ancithe:

thelockv-leveneleto plaoe the projection m; o e Voperativejrrelationlwitlntheiupper sideoflthe jproe 23; isv thus i'lookey meansgof thezprojectioh 36; f Q bein in the p h:-ofmovement ofthei-pljojjecfiionl' itto itsshifit posit-ion;aszhereinbetore set forth.

untill ireceipt ofi anionpesitashifit signal: or thei:

disc: it maybe errangedrtozber easilyvrnov able" from;

When upper ceseioffigurxescharacters oic'cur'inq toi properly eonditinn" thedieoeivingnprinter' to rer-i frequently, and on thetrensmiesiorroferr unshift;

duringfithe. ransmissiom of'the unshift sigrieLthisfl f1 linetime -i'sWasted; faJQoordan'oe with anoth'er" is autometically'returnedstotitslunshift posi'tionionrth'e transmissioir of a. word space: charaote'rfi'Thewordlspa'ce stophnembemmd; lectedzorrthereeeipt-ofiia'werdzspace s=gat, andthe eorrespomling position: on thetlpe' blank sothat,. on the'seleetiorr ofjthi's stop: mem

lia'd' bwmeanse-suchi'as SpOfiWEldilljgtisfa bracketm'emliaerlfil which;as shownlinlFig. 3, "h ts: at the: upper-ma: fhereofi a righmva rdlheXUeIldiIIgfpr0 j'eetion-A'E whichtextends zoverend azboye ezp'roj'ec-qthe; bracket.- member "46:

in i'operetive m mic; albeit oranges; p

screw 5% supponted inr the mounting: fplate- 3.9

' toits unshiftposition. e

' ,It is obvious, of-course, that various modifica cperative'ienuon withth upper cit-the lock 1 1 lever 31, as shown'in' igs'rand 2. r I On theselection of the word space stopmernber 19d; the bracket member 45*securedthereto causes the bell crank' ij to pivot in -a counter.clockwise direction and during such pivoting the arm53 engaging the locklever 31 pivots thesame to removeith'e projection 36 from; operativerelation withthe projection 34 on the lock plate 32.

Thus, the shift disc 23 is" unlocked, and} the unlocking thereofoccurs-during the first part of the movement or selection of theword-space stop member l9d; During the latter part of theinward-movementof the stop member- IQdfthe angleprojection 41 of the bracket'memberfisengages-the projection48 of the-shiftvlever' flcto T ,pivotthe same in'acounterclockwise direction to shift-the shift disc from'its shiftposition to its the'shiftingthereof from its shift to 'its unshiftposition. The selection of the stop member l9d with'the shift disc 23in-itsunshift position u mks the shift disc, but with the disc-in its'un shift position the shift lever is so-pos'itioned that there is noengagement between these'c'tion 41 of the bracket member'andtheprojection-548 on the. shift lever 24. On the following selection theword space stopmember' 19d will be cammed selected positions tooperatc'said shift idisc' look ing means to unlock said. shift dis'c andto then,

positions to the other. 7 J 3;"In'a' typewheel'shaft stopIunit inc d amovesaid' shift discfrom either one of its two set of differentlynotched-code discs selectively unshift position, providedthels'ameiisi'n its shift 7 position on the receipt of the word spacesignal. Thus, the selection'of the'woi d space stop mem ber 19d effectsunlocking of the shift disc 23 and:

positionable into; either one orthe other of two positionsasetof-selectable members associated with and" selected by entering rowsof aligned notches inlsaid discs, a shift disc, locking means forsaidshift disc, said means normally locking said=disc in eitheryonaor theother of its two positions, means operative'on the movement ofpredetermined of said selectable members to selected positions tooperate said shift disc locking means to unlock said shift disc and tothen move 'said'shift disc from either one of its two positions to "theother and means operative on the movement of saidpredetermined'selectablejmember from-selected toinormal positions torestoresaid shiftdisc locking me'ans tonormal to lock said shift disc in thep'osition towhich the same may be moved by the selection of said'predete'rminedselectable membersback :into its normal position, whereupon the locklever returns to its normal position and locks the shift disc inthemanner hereinbefore described;

' Thus, the selection'of a word space signal 'with the shift disc in;its shift position unlocks the shift disc and moves the same back intoits un-' 1. 7 shift position simultaneously with the word spacing of therecording medium in the associated *recording mechanism, and itisunnecessary' to transmit an unshiftsignal to return the shift discsaid" shift discby its'position permitting the se-f 4; In a typewheelshaft stopunit of the type described-including a' set of notched ;codediscs. e selectively positionable in accordance with receivedsignalcode'gro'ups int'oone or the other oftwo'positions, a set ofselectablemembers associated with said discs and selectable byen terin'grows of aligned notches thereimsaid mem-' bersbeing divided into twogroups'with a, member from each group being selectable for predeterminedsettings ofsaid code discs, a shift' disc movable fromone tothe;otherof;tw'o positions,

lecticn of members in one of said groups while preventing theselection'of members in the other tions of the invention maylbevmadewithout departing from the spirit orzes'sential attributes thereof, andit is desired, therefore, that only suchflimitationsbe placedthereon asare imposed v v by the prior art or are specifically setforth in theappended claims.

- Whatis claimedlsz'v 1. In a typewheel shaft stop unit including set ofdifferently notched code discs selectively I positionable into eitherone or the other of'two positions,-a set of selectable membersassociated with and selected byentering rows of aligned notches in saiddiscs, a shift-disc movable from' one into the other of two positions,locking means for said shift disc, said means normally locking said discin either one or the other of its two positions and meanscontrolledbytheselection of group, a lock lever for locking said shift disc in' either]one of its two positions, a'first and a second predetermined selectablemember for shifting said shiftrdisc on the selection thereofjand athirdpredetermined selectable member for operating said lock lever tounlocksaid shift disc" V topermit'movement by said first orse'conds'electable member; said third selectable member being selectedsimultaneously with the selection a of either said first or secondselectable members."

, 5. In :a typewheel shaft stop unit of the type described including aset of notched code discs selectively positionable in accordance with'received'icode groups'into'one'or the other of two positions, a setofselectable members associated with said discs and selectablebyenteringrowS of aligned notches therein, said members being" a dividedinto two groups with a member from each group being selectable forpredetermined" settings of said code dis-cs, a shift disc movable fromone to the other of two positions,'said predetermined of said selectablemembers for opcrating said shift disc locking means to unlock said shiftdiscand for. shifting the same from "either one of itspositions to theother.

2.-In atypewheel shaft stop unit including a set of "differently notchedcode discs selectively positionable into either one or the. other of'twopositions, a set of selectable members associated' shift disc by itsposition permitting the selection ofmembers in one of said groups Whilepreventing the selection of members in the other group, a lock lever forlocking said shift disc in either one of its two positions, meansoperative on the selection of a predetermined selectable member withsaid shift discin a predetermined one of said two positions to operatesaid lock lever, and means operative on the selection of saidpredetermined selectable member'with said shift disc in the other one ofsaid two positions to operatesaid lock lever to unlock said shift discand to move thesame' into the predetermined one of said two positions. v

.- 6. In a typewheelshaft stop unit of the type described including: .aset of notched code discs j selectively positionable in aocordanc'ewith: re-

eeived code groupsjnto one or the other of: two positions, a set ofselectable members associated with said discs-and selectable byZ'entering rows ofaligned notcheslthereim said members being dividedinto shift. andunshift groups, a shift .disc

selectable member andan unshift selectable member selectable in responseto respectivesig nal' groups,- means controlled by saidshift and"unshift selectable members to shift said shift disc in -a'ccordance withthe selection thereof, and;

means for disablingsaid loeking means on the member to permit the sameto shift saidshift disc. v V

'7; In a typewheel shaft stop unit of the type shift. and] unshiftselectable members to fshift selection of said shifti and unshiftselectable described including a set of notched 'code discs selectivelypositionable in accordance with re-* yeeived signal code groups into oneorth other of two positions, a set of selectable members associated Withsaid discs and selectable byfen tering rows of aligned notches therein,said members being divided into shift and unshift groups,

a shift disc having a shift andan unshift' position, said shiftdiscpermitting selection of one of said groups of selectable members ata time in accordance with the position thereof, means for V positionand'mean's operativeby the selection' of 1 looking said shift disc ineither of'its twoposi- I ftions, a shift selectable member'and anselectable member selectable in -'respon seito i Gthereof, aselectablemember for controlling said, Ilocking means; said member beingj's'elected i "si multaneously with the selection of eitherI-said'.

"8 in a'typewheel shaft sto e H described includinga set of'notch'edcode l discs selectively positionable in accordance withre ceivedsignal'code groups into oneor'th other v V sociated' 'with said discsand selectable by enterbeing divided into shift" and unshift groupsfa'said shift disc controllingbyits position theselection -ofselectablemembers fromfeither. oneor the other of said-groups, a'shift'and'an unshift selectable member; means. controlled by the se-;:

into corresponding positions,fajthirdl selectable V the same to itsothefpbsitidn. a

spective' signal. groups; means controlled by; said j said shift discLinaccordancefwith, the selection shift or unshift selectable member tounl'ock said' shift. disc to permit shifting'thereof by said shiftorunshiftselectable members, j; l I I hit of the type of two lpositions,a set of selectable membersfas m rows of aligned notches therein,saidniembers shift disc having a shift and a unshift position;

lection ofssaid memberslto shift said shiftf disc i member selectablewith said shift. disc'in either said third selectable memb'er witl'isaid shiftdisc V v in a redeterminedone iof'said"positionsjto shiftERNEST W; HEWrTT

